first commit

src/main/resources/mapper/book/OrderCartDao.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.peanut.modules.book.dao.OrderCartDao">
+
+	<!-- 可根据自己的需求，是否要使用 -->
+    <resultMap type="com.peanut.modules.book.entity.OrderCartEntity" id="orderCartMap">
+        <result property="cartId" column="cart_id"/>
+        <result property="userId" column="user_id"/>
+        <result property="productId" column="product_id"/>
+        <result property="productAmount" column="product_amount"/>
+        <result property="price" column="price"/>
+        <result property="createTime" column="create_time"/>
+        <result property="updateTime" column="update_time"/>
+        <result property="delFlag" column="del_flag"/>
+    </resultMap>
+
+    <select id="getDeteleOrderCart" resultType="com.peanut.modules.book.entity.OrderCartEntity">
+        SELECT
+            *
+        FROM
+            `order_cart`
+        WHERE
+            product_id = #{productId}
+            AND user_id = #{userId}
+            AND del_flag = -1
+    </select>
+
+
+</mapper>